MD5/SHA Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes instantly.

Need to hash passwords? MD5/SHA are not suitable for password storage. Use Bcrypt Hash Generator → instead.

How Hash Functions Work

A hash function takes any input and produces a fixed-size output. The same input always gives the same hash, but you can't reverse it - there's no way to get the original text back from just the hash. This one-way property makes hashes useful for passwords and data verification.

MD5 and SHA-1 are older and faster but have known weaknesses. SHA-256 and SHA-512 are currently considered secure for most purposes. For password storage, specialized functions like bcrypt or Argon2 are better choices than plain hashes.

Hash Output Sizes

MD5
128 bits
32 hex chars
SHA-1
160 bits
40 hex chars
SHA-256
256 bits
64 hex chars
SHA-512
512 bits
128 hex chars

Understanding Cryptographic Hash Functions

A hash function takes input data of any size and produces a fixed-size output called a hash, digest, or checksum. Cryptographic hash functions have three essential properties: they're one-way (you can't reverse a hash to get the original input), deterministic (same input always produces the same hash), and collision-resistant (it's extremely difficult to find two different inputs that produce the same hash).

Choosing the Right Algorithm

  • MD5:Fast but cryptographically broken'use only for checksums, never security
  • SHA-1:Deprecated for security; avoid for new applications
  • SHA-256:Excellent balance of security and performance; recommended for most uses
  • SHA-512:Maximum security for sensitive applications; slightly slower than SHA-256

Frequently Asked Questions

Can I use these hashes for password storage?

These basic hashes are NOT suitable for password storage. Passwords should be hashed using specialized algorithms like bcrypt, Argon2, or PBKDF2 that include salting and are intentionally slow to prevent brute-force attacks.

Why are some hashes longer than others?

The hash length corresponds to the algorithm's bit size. MD5 produces 128 bits (32 hex characters), SHA-1 produces 160 bits (40 hex characters), SHA-256 produces 256 bits (64 hex characters), and SHA-512 produces 512 bits (128 hex characters).

How do I verify a file's hash?

Hash the file using the same algorithm as the published checksum, then compare the results. They must match exactly. This verifies the file hasn't been corrupted or tampered with during download.

What is the difference between hashing and encryption?

Hashing is a one-way function'you cannot recover the original data from a hash. Encryption is two-way'encrypted data can be decrypted with the correct key. Use hashing for verification and integrity checking; use encryption when you need to recover the original data later.